<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>async await请求AJAX</title>
</head>
<body>
    <div>
        <button id="btn">点击发送 AJAX</button>
    </div>
    <script >
        function sendAJAX(url){
            return new Promise((resolve,reject) => {
                const xhr = new XMLHttpRequest();
                xhr.open('GET',url);
                xhr.send();
                xhr.onreadystatechange = function() {
                    if(xhr.readyState === 4) {
                        if(xhr.status>=200 && xhr.status<300) {
                            resolve(xhr.response);
                        } else {
                            reject(xhr.status);
                        }
                    }
                }
            })
        }
        
        let btn = document.querySelector('#btn');

        btn.addEventListener('click',async function(){
            let text = await sendAJAX('https://api.github.com/users/shunwuyu');
            console.log(text);
        })
    </script>
</body>
</html>